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sweep

  1. RT60 big differences for different frequencies

    REW Forum
    Dear All, I am using REW 5.1 on Mac El Capitan with a Scarlett 2nd gen 2i4 sound card and a Dayton Mic, both of them with a cal file. I am measuring RT60 on an empty room that is about 58K2 cubic feet. ( 1650 m3 ). I used two speakers and one sub to generate the sweep. I tried sweep ranges from...
  2. Sweep length versus IR Phase

    REW Forum
    I am using a USB calibrated UMIK-1, a USB DAC and REW 5.20 Beta 12. I noticed that the IR plots phase inverts as the sweep length changes between 128K and 1M. Is this normal behavior ? If so, why would the polarity change based on the sweep length ? :huh: TIA
  3. REW won't wait for me to play the sweep

    REW Forum
    Hi forum-- I'm trying to use FB2K to play my sweep so that I can test my rePhase impulse+convolver. So other forum posts say to "Use acoustic timing reference" and check "Wait for timing reference". Ok, did that. But when I click Start Measuring, REW play a chirp and plays a sweep. It does not...
  4. Help with REW RTA measurement on generated sweep

    REW Forum
    Hello, This is my first post here and first stab at REW after lots of reading and video watching. I wanted to share what I did as a workflow and the graph I got so that someone can help me further as the results do not make sense to me. 1. Installed REW 5.19 with java 2. Connected my miniDSP...
  5. Record Frequency Sweep via Linux Terminal & Export to REW On Windows

    REW Forum
    I have used REW on Windows for some time, but I've also started putting together an active stereo system controlled by a minimal install of Ubuntu Server. Since I assume REW on Linux requires a graphical interface, is there a way to simply record a frequency sweep through the terminal which I...
  6. MATT instead of the freq sweep method?

    REW Forum
    An old friend came by who used to be in the studio room treatment business. He tells me I should not be using frequency sweeps in REW because steady state tones do not give a good representation of real music (which of course is not steady state). He said I should use the Music Articulation Test...
  7. Stuttering sweep

    REW Forum
    I have guy I'm helping out measuring using REW. He's using a low cost Roland sound card. The measurement sweep he get's is choppy/stuttering, which isn' the case when he measures with ARTA. Any clue to what this could be?
  8. Sirene like sound during sweep

    REW Forum
    Hi, when i run a sweep signal, i can hear a sirene like sound in my mid driver. I also see a peak in the third harmonics distortion in the 1 - 2 khz range. I measure at 75db level and there is no clipping (microphone on 1 mtr.). The distortion is less when i use a lower output level and a...
  9. PN vs Sweep

    REW Forum
    I measured my 2-way active system in my car wit REW 5.14 .) 3 different positions measured with sweep(averaging to one frequency response) .) With perodic Pink Noise and mic movement from the left to the right ear. Use RTA with option <Adjust RTA levels> Why i get so much differents results ?
  10. THD+Noise using sweep

    REW Forum
    Hi all, I've been looking for a software that does THD+Noise measurement across a specified range rather than a single frequency, but no luck so far. So I'm starting to doubt if this is actually possible to do. I know REW does generate THD from the sweep, but not THD+Noise. I've also seen...
  11. Sub cal tone and sub sweep at same -dB level give different SPL readings.

    REW Forum
    I have a CSL EMM-6 (w/ sensitivity) and a Scarlett 2i2. I used this basic method to calibrate the SPL of REW. I have the mic calibration file loaded in REW as well as one for the audio interface. I take a sweep at a given level using HDMI (ASIO4ALL) from the PC to receiver, say -30dB in REW...
  12. Sweep recording Audacity

    REW Forum
    I was just testing some recordings in REW (Latest Version) In one of the recordings i record the sweep to Audacity. My test signal is around the -3dB FS but audacity recording is much lower. around the -18 dB FS. I use a macbook (2008 late) with OSX 8.5 and as internal audio pipe i use...
  13. Measurement Sweep Range and Accurate Response

    REW Forum
    I've been using REW for some time now, and I noticed something about how it works which I wanted to ask the forum about. Specifically, the question has to do with measurement sweeps and the range we set. I noticed that when I set a range for a measurement sweep, the results at the start...
  14. Different sweep volume levels result in different responses

    REW Forum
    I took 3 sweeps at different volume levels (I calibrated each using SPL meter), no other changes. purple = 85dB green = 75dB red = 65dB The 200hz and up region is what I was expecting to see across the entire frequency spectrum. Look at how bloated the bass gets on the quieter sweeps. The 65dB...
  15. the quality of the sweep

    REW Forum
    after the sweep (or two if I have to load the file in a software stereo) how do I know if this is correct? in other words, how can I check that the sweep is done right? thank you.
  16. Difference; Internal Vs External Cal Sweep

    REW Forum
    Difference; Internal Vs External Cal Sweep: Maybe someone can help explain the source of an issue I have been struggling with. I need a wav file for both the REW 44kHz calibration sweep and the REW measurement sweep I use (12-20k). Background: I have noted for that SPL and phase responses...
  17. Different responses for different sweep iterations

    REW Forum
    I'm getting a different response curve depending on how many sweeps I do. One sweep gives a relatively flat response, but the treble drops off the more sweep iterations I do. I'm using the UCA-202 soundcard and the UMM-6 microphone, with supplied cal files. To my old ears the response from...
  18. External Sweep File?

    REW Forum
    Hi. I have a simple question. I want to measure a so called room correction plug in which I use in Logic. If I use the plug in system wide I have to route the input of my interface to the output. With this I cant do measurements anymore because I would get a feedback. Is there an external...
  19. Sweep does not stop at high cutoff

    REW Forum
    I tried doing full-frequency sweeps of my system today using REW5. I wanted to sweep from 15Hz to 15,000 Hz. Both the generator frame and the measurement frame assured me that this was the setting. However, when the sweeps actually happen, they go up to 24kHz! Even worse, around 15kHz, what...
  20. Sweep lengths,File sizes and Data Disparities

    REW Forum
    (smoothed 0.2ms for easy comparison) These graphs were taken one after the other. No changes at all. Red = 128k Orange = 256k Green = 512k Blue = 1M Why do the reflection levels change based on measurement file size? The data for the other measurements changes as well.
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